SCTE 40 2004

This standard defines the characteristics and normative specifications for the network interfacebetween a cable television plant and commercially available consumer equipment that is used toaccess multi-channel television programming. The interface is also compatible with existing settopterminal equipment owned by cable operators and with terminal equipment developed via theOpenCable™ specification process (see www.opencable.com). In this standard the CableNetwork Interface is defined as the interface between the cable drop and the input terminals ofthe first device located on the subscriber's premises regardless of whether that device is ownedby the subscriber or the cable operator. A coaxial-based broadband access network is assumed.This may take the form of either an all-coax or hybrid-fiber/coax (HFC) network. The genericterm "cable network" is used here to cover all cases. Cable networks typically use a sharedmedium,tree-and-branch architecture with analog and/or digital transmission. The keyfunctional characteristics assumed in this document are the following:

• Two-way transmission.
• The maximum optical/electrical spacing between the cable headend and the most distantdeployed terminal equipment is 100 miles, although typical maximum separation may be10-15 miles.
• A maximum differential optical/electrical spacing between the cable headend and the closestand most distant deployed terminal equipment is 100 miles, although this would typically belimited to 15 miles.

The cable network provides services utilizing 6-MHz in-band channel(s), out-of-band forwarddata channel(s), and out-of-band reverse data channel(s). The 6-MHz in-band channels are usedto transport digital services as well as analog services. These services may be either in the clearor scrambled.

A typical channel plan for a cable network places analog services (NTSC AM-VSB channels) inthe 54 to 450/550 MHz range; and digital services (QAM MPEG-2 multiplex channels) in the450/550 to 864 MHz range (Note 1). These channels shall all comply with the EIA/CEA-542-Achannel-tuning plan. However, the frequency location may change over time such that analogand digital channels may be located anywhere in the downstream operating range.

Details

Published:

01/01/2004

ANSI:

ANSI Approved

Number of Pages:

32

File Size:

1 file , 130 KB